Battery charger



FIG. 1 is a perspective view of the top, front and right side of abattery charger showing my new design;

FIG. 2 is a perspective view of the bottom, rear and left side thereof;

FIG. 3 is a perspective view of the top, front and right side of asecond embodiment of a battery charger showing my new design; and,

FIG. 4 is a perspective view of the bottom, rear and left side of thebattery charger shown in FIG. 3.

The ornamental design for a battery charger, as shown and described.